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I think this should qualify for Danger Zone: Bought 6x HP Bladesystem 7000 12V 2400W power supplies for next to nothing (about 7usd/pcs) Connected in parallel I should have compact 12V 1200A power supply. :unsure: Now I'll just have to find bunch of those C19 power cords. Looks like I'm going...

Was thinking of solar panel matching to resistive heater when it occurred to me that diode string as a heater would be almost perfect match to solar panel output characteristics (at least compared to resistive heater) Comes with some obvious limitations like limited temperature range and need...

Interesting car magazine test on electric cars in winter conditions: Pretty wild results on braking test on a icy surface, VW ID Buzz takes 220 meters to stop when most of the other cars average around 90 meter braking distance. According to article this is common problem with VW/AUDI MEB...

Visiting my parents in ”central” Finland. Nice sunny day for a brisk walk in -25C weather. Sun doesn’t get that high at this time of year even in midday..

This might be of interest for european members: Some decent offerings like 545W panels for about 150 EUR https://www.secondsol.com/en/anzeige/28577//risun-gmbh-vendato/mono-545w

Most seem to be concerned about matching capacity and internal resistance for the cells in battery pack. IMO that is wrong approach if your concern is long-term pack balance. What you would need is to match is self-discharge and coulombic efficiency as these are the actual players driving your...

For giggles I compared the 25mm2 terminals: Aliexpress SC25-6: sleeve for wire: ID 7,36 mm and OD 9,00 mm, Wall thickness 0,82 mm Industrial "tubular cable terminal" ID 6,98 mm OD 10,05 mm, wall thickness 1,54 For crimping I used Chinese HX-50B crimper...

This goes to more advanced hacks but if you need really accurate high current measurements you can find used fluxgate (no kidding!) sensors from ebay cheaply. 600A ”ultrastab” are linear to 1ppm and despite the 600A max current you can measure rather small currents with these. Before You all...

Quite many BMS's have overload protection but is any of these able/designed to handle short-circuit? How much delay and is there minimum/maximum tolerable wiring inductance? Yes, you can and should use fuses but there is still question which one reacts first and if the first device to respond...

Due to various reasons(red tape, inspections, certificates..) 24v cooking equipment would be easier than inverter+230v equipment. Based on google microwaves and cooktops exist(India, alibaba?) but does anyone have experience with these? DIY inverter packed inside microwave would be one...

OK, lets assume small RV/stealth camper van in southern Europe (Fiat Ducato, Dodge Promaster for mericans) "Stealth" camper van so no windows in living area or small windows to shadows side. Insulated wall between cabin and living quarters. 30 mm insulation with PIR foam(lambda 0,022) or...

Balmar being rather expensive and close to non-existing here in Europe I was looking for alternative options to charge LiFepo4 battery bank with higher currents and thought about taking advantage of "smart" alternator feature on many cars. GM alternators for example seem to be super simple to...