Feb 27, 2001

My two Siemens 75W solar panels on a Stekel regulator helped a lot to maintain refrigeration without overusing the engine. I might consider 55W if redoing, in order to locate and move/orient them more easily at sea and in harbor, on a space limited Seawind II 32ft ketch (25.6 ft at waterline).

Sent: 6/3/01 7:05 PM

Gentlemen: Arthur Rudin was of good help in helping me to reach a decision to buy two SP75 panels from your distributor Penobscot Solar in Maine, almost 2 years ago.

They served well around the Atlantic and back via Caribbean. However, at commissioning, I measured their output, and one SP 75 shows only 9.9 volts, instead of 19-20 v as usual and on the other panel.

Daryl DeJoy of Penobscot Solar thinks there is a failed diode in the connection box underneath the panel. He suggests I contact you at 805 482 6800 for the right reference, if you cannot send me a replacement.

Please note that this may be due to a leaking contact box. During commissioning and before I measured outputs, that panel was left momentarily on deck with its cristal face down, and it rained briefly on it. When I straightened it after the rain, the box leaked briefly, may be o.25 cc, at the cable entry.

Besides a new diode, or reference thereof, if you agree this is the problem, please advise the best way to restore the integrity of the cable entry seal in that connection box, and how to check the other panel's..

Thanks in advance, I try email first as it should be cheaper for all and more efficient timewise.

Kind regards,

Bert de Frondeville, 19 Hook Rd, Rye NY 10580, Tel/Fx 914 967 4970,

Sent: Sunday, June 03, 2001 10:43 PM

Dear Bert,

I suspect that one of the bypass diodes in the module is in a short cicuit condition. I suggest that we send you a new diode to replace the shorted part. We can send it to your NY address. I need to understand what wire entry point you used in the junction box, if it was the foam seals, we will send you new ones.

Best regards,

Arthur Rudin

June 04, 2001

Dear Arthur: Thank you so much for your prompt faithfulness! (neither "sales", nor "customer.service", were accepted by your postmaster, fortunately I had kept on file your useful 1998 email). I repeat my address:

B. de Frondeville, 19 Hook road, Rye NY 10560, Tel/Fax 914 967 4970.

There is only one entry point I can see, where the cable goes into the P75 panel's black junction box (from the wall plug in the cabin, near the STECA regulator). It is about 1" in diameter, with slots on a cover ring allowing to squeeze the gasket/seal whatever it is.

Is the diode replacement simple (instructions by email + sketch by fax

as necessary?), or should it be done by an electronic technician? I am an engineer, but not an "electronician", and have not soldered since engineering academies (Naval Architecture in Paris, then Nuclear engineering at Berkeley...).

Kind and thankful regards, Bert de F,

June 03, 2001

Dear Bert,

I suspect that one of the bypass diodes in the module is in a short cicuit condition. I suggest that we send you a new diode to replace the shorted part. We can send it to your NY address. I need to understand what wire entry point you used in the junction box, if it was the foam seals, we will send you new ones.

Best regards,

Arthur Rudin

June 06, 2001

Dear Bert,

We will send you 2 diodes & the foam inserts. Also enclosed will be the instructions for the installation of the diodes.

Best regards,

Arthur Rudin

Manager Product Marketing and Training

Siemens Solar Industries

Camarillo, CA, USA

Tel: 805-388-6525

Fax: 805-388-6395

Sent: Wednesday, June 06, 2001 4:40 PM

Dear Arthur: I repeat, just to make sure it has your atention, as my refrigeration depends on these two panels if I don't run the engine once a day. Please let me know when you send the diode (2 if that is a typical failure and not expensive, since I have two panels?), and if you can fax or send along the dismounting and remounting, replacement instructions.

Kind regards and thanks in advance, Bert dF

Jun 6, 2001

Thank you very much, please advise how I may best recognize the classy customer support I receive from you (once I receive the spares), besides writing to Practical Sailor about it?

Kind regards, Bert dF

August 15, 2001

I have 2x200Ah AGM batteries as house bank and an Optima for starting battery, protected from the former by a simple solenoid. I monitor this dual system through an E-mon from Ample Power, and have upgraded my alternator to an Ample Power 100A. No generator, only two Siemens SP-75 solar panels with a Steca regulator, which allow refrigeration without having to run the engine every day.

Oct 18, 2001

We have two banks of golf cart batteries under the locker on the starboard side of the cockpit. They are kept charged by a 60 watt solar panel mounted on the bimini.

We believe in multiple ways to generate power and therefor have not ever been without adequate power. I might add that our refrigeration unit draws 27 amps per hour.

We also believe in simple systems, because once outside the U.S. in many areas of the world even getting parts for the simple systems can be difficult if not impossible.

We also believe that if you have a system on board you should have the skills necessary to remove the unit, dis-assemble it, repair it, and re-assemble it to a like new operating condition. This limits us to simple technology as I'm not of the genius catagory.

1729 Mar 31, 2002

Hi All-

Iím considering fitting two Siemens 75 watt panels on City Bird. I was wondering (Bert,Don) where in the heck to put these guys! Does anyone have any ideas or experience on locations (I dont have a bimini)...Thanks

Bill S.


1732 Mar 31, 2002

Bill S,

We installed a "small" bimini aft of the mizzen mast and upon it my wife Brenda cut out two spaces for future installation of two panels. We purchased our first 60 watt panel and found that it provided all the electricity we need, so we never purchased the second one. A short outdoor extension cord leads to an outdoor outlet mounted within the winch handle pocket on the starboard side of the cockpit and then to a splitter which feeds the battery. We do not use a regulator as the solar panel is less than 10% of the battery bank capacity. This has worked very well now for 15 years and it almost made the wind generator obsolete. We use the solar 97% of the time. Wind generator 3% of the time but then we live in Florida.

Don and Brenda Bundy

Talisman #129K


1743 Apr 1, 2002

Dear Bill: my two 75w siemens panels are tied to a Steka regulator by 15ft cables and 3-prongs plugs which allow me to move the panels around. For example, on crossing from Cape Verde to St.Martin, they were on the cabin top, leaning on the port hand hold and held obliquely by the liferaft (aft panel) and the port cabin cowl (fwd panel). They can be both laid across the forward deck, leaning on the bagged inflatable, etc.

A simple 1" wide and 1/3" deep notch on each topside of the top hatch board allows to close the hatch board without hurting the wire, while the sliding hatch cover comes over these slots to keep the rain out.

Siemens replaced one of the panels that had lost its output, it only cost me the UPS ground shipping to them.

Any question? Good luck, Bert de F, 80K

1750 Apr 2, 2002

Hello Bill,

This Willy Herold of Hull # 100 "UNDENE". I moved my Solarpanels from the Bimini (Threw it away, because I want to see the stars) forward on either side of the saloon hatch. Mine are a fraction too wide, but the Siemens you chose, should fit exactly. I did have no troubles stepping on them or finding them out of place so far (6 months sailing) and I consider a refit with the Siemens you intend to use. So far they are mounted on a simple wooden frame which is not fastened to the cabin at all.

I hope to have been of assistance. fair winds


1759 Apr 4, 2002

In order to maintain UL listing and FM approval these modules require the installation of bypass diodes.

Parts required:

Siemens Solar part number 019336-01 diode assembly.

Or the following components:

1. Motorola model MR 751 or General Instrument model GI 751 diodes.

2. Non-insulated fork type solder-less terminal (2 required).

Assembly of the diode (if Siemens Solar part number 019336-01 is not used):

Refer to figure 1.

Cut the leads of the diode to length.

Attachment 90k (application/octet-stream) USING.com

Attachment 327k (application/octet-stream) Bypass_diode_Inst.doc