Chris Olson wrote:
Instead of buying a couple new 1300ah 24V forklift batteries you could've bought four Rolls 12CS11P's for $4400 bucks, work the snot out of them and they'll still last 10 years. The CS plates in the 5000-series Rolls batteries are considerably heavier duty than forklift battery. Forklift batteries often have tubular grids and are more prone to stratification from RE chargers that don't put out enough power to properly charge one. The 5000-series Rolls is a dual container battery with "jars" just like your forklift battery, and you can replace individual "jars" if one goes bad over time. The 5000-series Rolls batteries have sailed the Atlantic in fishing trawlers and yachts for close to 30 years and they are THE only kind of batteries most boat captains will buy for their boats, where having a battery failure at sea is not an option.
Peter Berg wrote:
Robert Dearborn wrote:One feature im unclear on from the sketches and the podcast - is there a heat riser inside the barrel above the heater ? What is its proportion ? Im assuming it doesnt reach to within 2" of the underside of THAT monster barrel !
Your assumption is spot on, there is a riser inside the barrels. It's reaching up to about 3 to 4 inches below the top of the first one, so the top gap is one barrel plus 3". The riser is an 8" ceramic fiber tube, it could be shorter but it is being used as a whole.
paul wheaton wrote:Steven Harris just sent me this email:
I own NiFe batteries, I have since 1994. I know them well. The BIG reason to NOT buy them, they are incredibly expensive, they are charging you 9x the price of a lead acid and guarantying you only 5x the life. NiFe batteries are VERY inefficient, which means a significant fraction of the energy you put in, does not get stored, something like around 25%. They are VERY VERY gassy, that is why there is such a huge head space on them to hold SO MUCH extra water, which MUST be distilled water ONLY. They have a high rate of self discharge, so if you just leave them there, they can loose 10% or more of their charge PER DAY.
so yeah...they have a very long life, but everything else they have is a huge disadvantage.