Re: [RE-wrenches] Subterranean solar panels

Using Fresnel lens technology, a solar collector surface can concentrate the suns energy into very small areas of >1000W/m ² . You still need to capture enough sunlight [1m²] to get the 1000W in the first place. The lens' are very thin and can be curved which acts like a convex lens over a clus

[RE-wrenches] Charging AGM Batteries

I have been told that AGM batteries can withstand pretty aggressive charging rates, with a bulk rate being ½ of C/20. For example a MK 8A8D, with a C/20 of 245 A-h, would start with 122 A. If this is okay, can I still use the standard 14.6 V value for switching from Bulk to Absorb? What about ambie

Re: [RE-wrenches] Charging AGM Batteries

Hi Peter, At least some AGM's (like the Concorde) can handle very aggressive charging rates, provided you have good temperature compensation to reduce the possibility of a thermal runaway. Also the 14.6 VDC is a little higher than recommended, at least for the Concorde brand. 14.4 VDC (2

Re: [RE-wrenches] Charging AGM Batteries

HI Peter, I don't know of any sealed that go above the 14.4v/12v setpoints. And most I've seen a 14.2 ish. That said I have seen eq recommendations for industrial sealed, but with very controlled conditions. above 14.4 it will start to gas just like a wet battery. jay peltz power On Sep 15,

Re: [RE-wrenches] Charging AGM Batteries

Surrette battery has just come out w/ their newest product.AGM batteries. They also have quite a paper on charging these units. Perhaps someone at Surrette or their web site has the "Rolls AGM Battery Charging Instructions" if not contact me off list.TUMP t...@sw

Re: [RE-wrenches] Charging AGM Batteries

Peter, The DEKA charging manual that I have been working from for their sealed batteries (AGM and Gel) quote 30% of C20. And….DEKA’s literature also has a maximum charging voltage of 2.35 VPC. Not sure about the other brands. Thanks, Walt From: re-wrenches-boun...@lists.re-w

Re: [RE-wrenches] Charging AGM Batteries

I suggest that high rate recharge could be safely done but only with a charge algorithm more sophisticated than what is commonly found in renewable energy gear. The chargers typically found in our industry deliver the same "bulk" charge amperage from initiation of the recharge all the way to when