Burgerman wrote:Looking good. Only thing is its a bit wide. Motor compensation should definitely be 40 to 45 with those 4 poles though. And if its too lively reduce acceleration settings. Or damping. Or it will less able to auto correct for load.
Scooterman wrote:Cor that looks really really good, well done
The F55 is great design.
Burgerman wrote:Sounds like a typical mobility charger...
Burgerman wrote:Nobody can say, it has no actual specs we cant know. But the fact that it claims to charge all, isnt promising... Thats not possible unless the user chooses the specs. Also its only 4A. You need 12 ideally.
Burgerman wrote:Every charger will 'work'.
But again, if it claims to charge both gel and AGM which require different things, and without any kind of spec to see what it ACTUALLY does how can you know what it will do.
Many of those things would be OK on AGM, and murder a gel battery. As long as you charge for 16 hours every use and then disconnect. Why? Because they STOP the CV stage far too soon, charge at the correct 28.80V for AGM, and then rely on a too high 27.6V float to finish the charge. So that will likely cook the batteries if left connected long term.
But without further info, or control you cant know what they will do.
i fail to understand how the hell they get away with saying they do all batterys safely etc
Burgerman wrote:So, how lucky do you feel?
The invacare charger doesent actually have any spec you COULD write down. More like, random shit happens.
And millions of those have been supplied worldwide. Not to mention chinese clones. God knows what they do. Will it charge a battery? Yes. Sort of. Will they last? No. Garanteed! Does anyone care? It appears that they dont, and they dont understand there even is a problem.
The manufacturers certainly do. You lose SIXTY PERCENT of your battery life by goung just .7V too high. So for a gel battery at room temperature thats 13.8 to 14.1V. Or 13.95 bang in the centre, correct volts. So charging at 14.65V (see the yellow chart above) you lose more than half the cycle life. And undercharging, (stopping too soon) causes sulfation which also costs service life. MKs own data:
Next thread will be "I fitted a new set of [insert brand] batteries 3 weeks ago and they are not holding a charge...
like i have said before if your choices are do it cheap or not at all then which is better?
Burgerman wrote:like i have said before if your choices are do it cheap or not at all then which is better?
We were not talking about a full chair, only the charger.
Not knocking what you have done. Looks good. However, you will get a chair from WCS soon? It will have an 8A mobility charger with it. I have about 3 on the shelf at the moment. You can use it for both chairs while you save! As for what it actually does to or for the batteries nobody knows. Till you measure it.
Hopefully she needs a chair INDOORS primarily. Thats what the WCS will provide. Dont mention mud, parks, dogs! Hopefully the batteries will be MK or at least decent, and will swap over... Keep the good ones for the fat tyre chair. When knackered, put them back in the NHS chair and call them!
When the cheap batteries die, return under warranty. DO NOT mention wheelchairs, and they will replace FOC too.
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