24v system w/L16RE2v charge rate

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JRHill
Forum Czar
Posts: 924
Joined: Thu Feb 17, 2011 11:12 am
My RE system: VFX 3648, FM80, 3k panels, Mate3, FNDC (retired), 8ea L16 mixed. Wonderful wife.

24v system w/L16RE2v charge rate

Post by JRHill » Thu Nov 08, 2018 1:06 pm

I have a new neighbor that has a 24v system: I believe it has a VFX3524. Originally it was powered with a hydro unit that has about 300 watts max output and it ran off a drilled and capped artisian spring. The original builder/designer was a non-resident who was only here a few times per year and only ran it while here. The volume of water it takes is phenomenal. The new neighbor/owner is here full time. It didn't take too many conversations to convince the new owner that if he free flowed the artisian well 100% of the time to run the hydro unit that it could not only affect him in time but others within the same watershed. Add to that we are in the 6th year of drought.... Fortunately, he accepted the precaution and put up some panels and is 100% on those, archiving the hydro.

So here is the question b/c he asks me advisory questions: his batteries are tired. They are 6v Trojans, probably 8+ years old. Using T105s currently he has adequate amps from the inverter to charge them and within the recharge range from his panels/controller. But he should really have L16RE-2V for his usage. To recharge them sufficiently he would have to push in the range of 100+ amps at nominal 24v to keep them healthy. How the heck does one do that without multiple arrays on several FMs? Even if he could stomach the extra $ for the 2v Trojans, adding another charge controller and array is probably out of the question.

Any creative ideas out there? One can't defeat physics and my gut says he has to redesign and pony up.

Best,
Jim

petertearai
Forum Guru
Posts: 397
Joined: Fri Aug 06, 2010 4:35 pm
My RE system: 2220 watt pv, fm80, outback fxr 2000 watt inverter. Shoto 12 times 2 volt exc400 lead carbon batterys 24 volt system victron battery moniter. optics RE
Location: NewZealand North Island

Re: 24v system w/L16RE2v charge rate

Post by petertearai » Thu Nov 08, 2018 1:24 pm

change of batterys time is also a good time to look at inverter voltage . Inverter may also be getting old , time to go up to 48 Volts ?
2220 pv. fm80. 12 times 2 volt exc shoto lead carbon 450 AH 24 volts. victron battery monitor. outback fxr 2000 watt inverter

SandyP
Forum Guru
Posts: 421
Joined: Tue Jun 21, 2011 4:44 am
My RE system: 8 x 190W 24V Suntech panels (4 strings of 2) July 2011
4 x 325W 24V Suntech panels (2 strings of 2) added Sept2018
Mate2
Outback FM60 MPPT (max output lowered to 55amps)
12 x 2V Hoppecke GEL 660 Ah C100 - 24V System
Outback VFX3024 Inverter/Charger
Victron BMV-602s
Honda 5.5kW Genset
Location: Victoria, Australia

Re: 24v system w/L16RE2v charge rate

Post by SandyP » Thu Nov 08, 2018 3:41 pm

JRHill wrote:Any creative ideas out there? One can't defeat physics and my gut says he has to redesign and pony up.

Best,
Jim
How much power does he use/need? i.e. Does he need such a large battery bank or could he reduce the size (total amps) of the battery bank and hence need less charging amps?

JRHill
Forum Czar
Posts: 924
Joined: Thu Feb 17, 2011 11:12 am
My RE system: VFX 3648, FM80, 3k panels, Mate3, FNDC (retired), 8ea L16 mixed. Wonderful wife.

Re: 24v system w/L16RE2v charge rate

Post by JRHill » Fri Nov 09, 2018 8:35 am

SandyP wrote:How much power does he use/need? i.e. Does he need such a large battery bank or could he reduce the size (total amps) of the battery bank and hence need less charging amps?
We talked some more last evening and I loaned him my Kill-a-watt. He is just trying to conserve as much as possible at this point. At least he gets sunlight in the winter as compared to my location. We'll see how his usage study goes.

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