The Peukert Calculator found in the screenshot above is really a spreadsheet in Microsoft Excel structure that enables one to enter the battery pack capability and Peukert’s exponent.

After that it selects discharge that is various, calculates operate times (remember that the changing times have been in decimal hours in other words. 1.5 hours is 1 1/2 hours = 1 hr half an hour), Peukert corrected amps and total amp hours offered at different release prices. Additionally includes a graph of release current against available amp hours. The level of this impact might shock you. The calculator, authored by Chris Gibson, may be the copyright of SmartGauge Electronics and it is available right right here.

Now let’s put within an aging element of 0.8 (which means you nevertheless get things you need even though the batteries grow older) and abruptly the available Ah is 285 x 0.5 x 0.84 x 0.8 = 95.76Ah or 12V x 95.76Ah providing 1.15kWh of useable power in comparison to a stored C20 power of 3.42kWh 25°C. Not surprising people think their batteries require changing or they want more Ah!

The above pertains to battery that is lead-acid, lithium is a lot more forgiving by having a Peukert of around 1.05. You are able to learn about LiFePO4 vs AGM technology in a blog that is recent did concerning Victron Energy’s brand brand new SuperPack batteries.

Alternatives & a various approach

Considering getting decidedly more useable Wh for my motorhome we began considering upgrading my standard system, however the leisure battery pack is underneath the passenger chair with limited area, the wires operate underneath the floor and inbetween bulkheads, plus we required a larger charger, as well as an inverter to charge my electric hill bicycle. Possibly the alternator will have to be upgraded too. Anyhow hopefully you can get my point – it had been not really practical to modify the standard system either in terms of expense or work, in addition to the leisure battery pack been unique.

My solution would be to produce a different, standalone, portable ‘Powerpack’ – just like a powerbank for mobiles. It absolutely was something i possibly could come up with effortlessly into the convenience of my workshop (family area in reality). Admittedly we went significantly over the most notable – but that is the maximum amount of to illustrate so what can be performed and exactly how area and fat requirements can force an option.

Preferably I like Lithium-iron-phosphate (LiFePO4 or LFP) to the Lithium-Ion HE Battery and Lynx Ion BMS, as LFPs have actually a greater period life and also the HE BMS is fairly sizeable using up additional area. Yet this specific situation due into the real measurements associated with area available and fat factors I experienced to make use of the HE NMC kind. Luckily my inverter lots are low too, so that the HE type could accommodate them, whereas back at my ship LFPs are better as a result of that chemistry’s greater constant discharge prices. In fact were fat and size no problem then AGM’s will have been fine too, at the time of program would the all in a single design of this Lithium SuperPack range – having no need of an outside BMS using up space that is extra. You’ll see just what after all into the table later on in this web site.

Your needs could be more modest too when it comes to battery pack kind, energy and size – so besides personal Powerpack build I’ll include other variations in a blog that is later which ultimately sjust hows just how to size an inverter for charging you electric bicycles off-grid as one example.

For now I’ll make you with a few before and after pictures of my solution, which merely goes inline with all the hook-up coast power ahead of the RCD/Consumer product into the van. Disconnect two male/female 16A commando type plugs/sockets and also the original system is returning to normal along with a Powerpack to be used somewhere else. By using this system my standard leisure battery pack is obviously complete off-grid, either charged from my Powerpack or solar, plus there’s energy that is increased energy readily available for the requirements mentioned earlier in the day.

The look phase

Pretty lights and LED momentary start switch. USB GPS setting a Geofence when parked.

Testing – electric bicycle battery pack charging you