FM80 minimum voltage input.

Discussion about the FM100, FM80, and FM60 Charge Controllers

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gazzer
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My RE system: 6x180w Evergreens, 3x180w Yingli, MX60, VFX3024, 3 x Rolls S530's + 27x5EPzS 775aH totalling 2150aH approx, 5.5KvA Honda all in a 4.5 sunhour average zone. 1kw future Energy wind Turbine. (The jury is "out" on that one!) The STUDER is GONE, good riddance!
Location: Malaga, Andalucia, SPAIN

FM80 minimum voltage input.

Post by gazzer » Tue Jan 08, 2019 9:18 am

I am trying to resurrect a system that I installed a number of years ago.

I have remade all the battery connections on the 24v 12x2v system. The total voltage seen across the batteries is 6.2v. Output voltage of the solar array 123v.

When connected to the FM80 there is no reaction. Is 6.2v too low to fire it up even though there is 123v coming in?
GAZZER

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Jorge Guzman
Strategic Platforms
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Joined: Thu May 29, 2014 9:44 am
My RE system: VFXR3524A, FM80, MATE3. 3x 260W REC. 4x Trojan L16 FLA 370Ah.
Location: Arlington, WA

Re: FM80 minimum voltage input.

Post by Jorge Guzman » Tue Jan 08, 2019 10:32 am

gazzer wrote:Is 6.2v too low to fire it up even though there is 123v coming in?
10.5Vdc is the minimum voltage to fire up the charge controller.

You may need to charge the batteries with an external charger. If these are 12V mono-blocs you could use an automotive 12V charger or wire them in groups of 12V.
Jorge Guzman
Sr. Strategic Platforms Analyst


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gazzer
Forum Whiz
Posts: 39
Joined: Sat May 03, 2008 7:49 am
My RE system: 6x180w Evergreens, 3x180w Yingli, MX60, VFX3024, 3 x Rolls S530's + 27x5EPzS 775aH totalling 2150aH approx, 5.5KvA Honda all in a 4.5 sunhour average zone. 1kw future Energy wind Turbine. (The jury is "out" on that one!) The STUDER is GONE, good riddance!
Location: Malaga, Andalucia, SPAIN

Re: FM80 minimum voltage input.

Post by gazzer » Tue Jan 08, 2019 11:17 am

Thanks Jorge. I'm currently cavassing locals for 2x12V vehicle chargers to bring the batteries up. I suspected as much! :grin:
GAZZER

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