2 years of lead abuse and I’m down to probably 10 miles max range. Arriving at the office\/home with major voltage sag <110v... :( The batteries were at least 3 years old when I brought them, and in my original plan \"buy a cheap set and run them into the ground\" so I was expecting not to get this much out of them. In the mean time lithium packs have really started to look really good, very stable, very long life and best of all much lighter. So my plan for the second set is purchase a brand new lithium pack.<\/p>\n
!!!Specification<\/p>\n
Current pack is 12 x 12v\/138Ah Lead Acid weighing in at healthy 1200 lbs in total.<\/p>\n
Per my EV calc model that gives me a 43.6 miles @ 30 mph, 25.7 miles @ 60 mph range.<\/p>\n
The actual should be somewhere in between two (for commuting).<\/p>\n
Experience has taught me 36 miles was the best range I ever got, and still arriving 80%, so it within the range.<\/p>\n
For the purpose of comparison the relative range is the key factor, as long as the Li pack is equal or better we should be in good shape.<\/p>\n
|!Cells|!Volts\/Cell|!Pack|!Capacity|!Total|!Weight|!30 mph|!60 mph|<\/p>\n
|12|12v|144v|138 Ah|19.9 kWh|1200 lbs|43.6 miles|25.7 miles|<\/p>\n
|48|3.2v|153.6v|100 Ah|15.3 kWh|370 lbs|48.5 miles|29.0 miles|<\/p>\n
|48|3.2v|153.6v|160 Ah|24.6 kWh|571 lbs|74.0 miles|45.0 miles|<\/p>\n
|48|3.2v|153.6v|200 Ah|30.6 kWh|686 lbs|90.5 miles|56.1 miles|<\/p>\n
So the 100Ah option should be equivalent to my existing Lead set up, two major factors here:<\/p>\n
1, My research indicates that ~LiFEPO4 do not suffer that same Puekert effect that Lead so a Li pack of 60-70% stated capacity of a Lead pack should have the same performance – that checks out.<\/p>\n
2. It weights 1\/3 of the weight<\/p>\n
The cost is more or less linear from 100Ah to 200Ah, and although it would be nice to have 80 mile range, my commute does not require it, so the more cost effective route is best for right now. As new battery technologies develop and as commercial offering expand I expect to be able to extend\/replace the pack.<\/p>\n
!!!Weight<\/p>\n
335lbs of Li vs 1200lbs of Lead… this can only be better me thinks…<\/p>\n
!!!Volume<\/p>\n
Li 100Ah cell: W 7.1 x D 2.5 x H 8.6<\/p>\n
Rear battery rack is:-<\/p>\n
Each battery is W 13.57 x D 6.63 x H 10.93<\/p>\n
Total size is 13.57 x 39.78 x 10.93 = 5900.17 cu in.<\/p>\n
Li Pack = 7327.2 cu in. (62% of lead pack)<\/p>\n
Lead Pack = 11800.3 cu in.<\/p>\n
Will try and fit complete pack under back seat, so can re-purpose the table for cables\/tools and behind the driver for a sub… maybe…<\/p>\n
Purchased complete battery and BMS from evolve electics, based in Colorado.<\/p>\n
!!!Batteries<\/p>\n
GBS 100Ah, come pre-strapped in blocks of 4 (12.8v), so 12 blocks of 4.<\/p>\n
Part number: ~GBS-LFMP100AH<\/p>\n
Datasheet on batteries here: http:\/\/elitepowersolutions.com\/products\/product_info.php?cPath=25&products_id=92<\/p>\n
!!!Battery Management System<\/p>\n
Manual: http:\/\/lite.elithion.com\/<\/p>\n
!!!Integration plan<\/p>\n
Plan to use the BMS SOC output to drive the original gas gauge.<\/p>\n
Will use large relay to control PFC charger AC input to give the BMS control of the charging process.<\/p>\n
Plan on connecting throttle control to BMS, to taper drive range when battery low.<\/p>\n
Other functions will be integrated as time goes on, will keep original shunt and volt meter for now, as independent measurement.<\/p>\n","protected":false},"excerpt":{"rendered":"
2 years of lead abuse and I’m down to probably 10 miles max range. Arriving at the office\/home with major voltage sag<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"categories":[9],"class_list":["post-110","page","type-page","status-publish","hentry","category-battery"],"_links":{"self":[{"href":"https:\/\/stealthbus.net\/index.php?rest_route=\/wp\/v2\/pages\/110","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/stealthbus.net\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/stealthbus.net\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/stealthbus.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/stealthbus.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=110"}],"version-history":[{"count":2,"href":"https:\/\/stealthbus.net\/index.php?rest_route=\/wp\/v2\/pages\/110\/revisions"}],"predecessor-version":[{"id":709,"href":"https:\/\/stealthbus.net\/index.php?rest_route=\/wp\/v2\/pages\/110\/revisions\/709"}],"wp:attachment":[{"href":"https:\/\/stealthbus.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=110"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/stealthbus.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=110"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}