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solar cells to lead acid battery charger with pic single chip computer

Dear Friends

I must design for my company a solar cells (17 V nominal) to lead acid gel battery (12V nominal, 14.6V charge final voltage) charger.

I want to use a pic single chip computer with A/D and D/A-converters for regualting between solar cells and battery/load line with two cool-mosfets (these are the same as a logic level mosfets). the unit should also prevent against solar back current in the night, overcharge, undercharge and load over current.

I also must implement a battery charge measurement (in Ah), i want to do this with the pic (measuring the battery charge/discharge current and integrating this current up/down respectively).

The surge load current is 20A or 40A, nominal load current is about 5A or 10A.

Do you have ideas, critics, questions or suggestions? I'm glad about every answer from you. I also would like to help somebody with similar questions. For a very helpful idea or a good design we would pay, if you want. Thank you very much!

Walter Nussbaum, dipl. Electronics Engineer ETH, Megasol Inc., H=F6henring 17, 8052 Z=FCrich

mail: snipped-for-privacy@gmx.ch

phone: +41 43 268 90 32 mobile: +41 79 297 62 78

Reply to
walle62
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check the archives here, Larwe posted a simalar question recently

From: snipped-for-privacy@larwe.com Newsgroups: sci.electronics.design Subject: Request comments on simple solar charger Date: 23 Jul 2005 16:31:12 -0700 Organization:

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martin

Reply to
martin griffith

dear martin

thank you very much for your answer.

i read in the archive, especially this article from jul 23 2005. it was very interesting and i learned something new again.

yours sincerely

walter nussbaum

mail: snipped-for-privacy@gmx.ch

Reply to
walle62

You may want to consider optimising for maximum power from the solar cells. Basically, you build a switch-mode battery charger which regulates it's power troughput to maximise I*V on the solar cell side.

That would allow you to extract maximum power under a wide range of conditions with less dependency of full sunlight.

Kind regards,

Iwo

Reply to
Iwo Mergler

Hi Iwo

Thank you for your answer. It's a good idea to use MPT, although it makes the SW a bit complex. But it's worth while to think about it.

Kind regards

Walti

Reply to
walle62

Dear Chris

You're absolutely right, but my chief want to design a own one..

Thank you very much for your suggestions.

walti

Reply to
walle62

Largely crap for homesteaders...very little technical content.

Reply to
Fred Bloggs

[snip]

Depending on cost and quantity, you might be able to buy this more cheaply than designing it. Have you read homepower magazine?

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There are lots of advertisements in there for charge controllers etc.

Chris

Reply to
Chris Jones

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