You are asking PoE NVR to Non-PoE IPCam, then you need to buy PoE IEEE 802.3af Splitter, Output must be 12V (Some big or PTZ Cam, use 24V). And check how many Watt also. Must match with your camera Voltage (V) and Power Consumption (W), if camera 4W, so ur Splitter must output at least 4W, or 0.33A.. (4W/12V = 0.33A)

IVMS is HIKVISION App, EZVIZ is P2P Cloud by HIKVISION and IVMS also support EZVIZ, using that, u no need DDNS and Port Forwarding. Suitable for those who use mobile broadband which don't hv public IP. Downside is, a bit slow compare to Public IP DDNS, and app/web playback no fast forward.

What kind of latency you are referring to?
Live view latency? Recording latency? Remote view latency?

My system Live view latency feels like 0.5 seconds, I am alright with it.

LOL RM350 

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at least RM750

Close to RM350...here you go https://reolink.com/product/rlc-411/

Has all the above except audio i think

If a robber can turn off the power socket, he can also smash off the camera easily whether it is solar/non-solar.
Unless you are talking about using whole house solar setup which is in different level.

If anyone has concern for power socket to be off by robber, simply make sure both socket and camera are high enough.
Or, just use a battery powered ip camera but there is hassle to recharge it especially when camera is placed high.

It's not about power source.
Robber may smash down (or spray) the camera whether it is solar battery or grid powered.
The key is the camera must be placed high enough first... when it is high, power socket can be high too.
Battery powered camera is difficult to maintain when the camera is placed high.

As we knew, both rechargeable battery and SD card (if use) have short lifespan.
Perhaps, you have not encountered it yet or your camera is easy to access for maintenance.

the current trend more to ip camera..
Brand like ezviz or reolink are selling like hot cakes..
try search them @ Lazada / shopee

Here's my 5Mp human detection