Battery questions
I know there are some very knowledgeable folks on this topic, hoping you'll chime in. Current set up is a small 17' hybrid that HAD a new (Costco), single group 27 12v (105 AH) battery. I use a 20...
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Let's just be honest with this guy.
You can't do what you want with what you have or even what you can add easily.
Even if you go to 2ea GC2s (which will handle the short term load in spite of what has been said here), your generator and converter charger will not be able to recover the bank past 90% in the 3.5 hours of generator time you are allowed even if you upgrade the converter to a 65 (about what GC2s can handle) be they either Progressive Dynamics or Iola. It just takes too long.
It may sound goofy since you are only asking for about 7.5 AH (including the Peukert function), but the fact is that recovering the top of the charge density where it is hardest because the chemistry cannot tolerate the plate voltage needed.
Go to the Progressive Dynamics site and read all about this.
You do have a single bar-cost option. Get a LiPo bank of over 100AH and use that. It can be recovered in as little time as you can provide power to do. Though the drag-down will not be good for it, it is not as bad as it is for a Pb/H2S jar.
One thing that seems to be missing here is how long you want to do this. If it is the two days of a weekend and then you will drag to PU home and hook it to shore power, the batteries (a pair of GC2) could stand that and with a good three stage (that is really 4 including the storage mode) converter, you could be ready to go the very next weekend.
I did a lot of this stuff for performance cruisers (read retired racing sloops) before the depression killed the business. This was not an uncommon issue.
Matt
You can't do what you want with what you have or even what you can add easily.
Even if you go to 2ea GC2s (which will handle the short term load in spite of what has been said here), your generator and converter charger will not be able to recover the bank past 90% in the 3.5 hours of generator time you are allowed even if you upgrade the converter to a 65 (about what GC2s can handle) be they either Progressive Dynamics or Iola. It just takes too long.
It may sound goofy since you are only asking for about 7.5 AH (including the Peukert function), but the fact is that recovering the top of the charge density where it is hardest because the chemistry cannot tolerate the plate voltage needed.
Go to the Progressive Dynamics site and read all about this.
You do have a single bar-cost option. Get a LiPo bank of over 100AH and use that. It can be recovered in as little time as you can provide power to do. Though the drag-down will not be good for it, it is not as bad as it is for a Pb/H2S jar.
One thing that seems to be missing here is how long you want to do this. If it is the two days of a weekend and then you will drag to PU home and hook it to shore power, the batteries (a pair of GC2) could stand that and with a good three stage (that is really 4 including the storage mode) converter, you could be ready to go the very next weekend.
I did a lot of this stuff for performance cruisers (read retired racing sloops) before the depression killed the business. This was not an uncommon issue.
Matt
